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Comparison of fatty acid methy ester (FAME) abundance in Fremyella displosiphon treated with 0.8 mg/L ampicillin, 3.2 mg/L nZVIs, combination regimen of 0.8 mg/L ampicillin and 3.2 mg/L nZVIs, and untreated control. Different letters a and b above the error bars indicate statistical significance (p < 0.05) among treatment means (Tukey’s post-hoc test). Error bars indicate the standard error (SE) of the mean
